This is a paid app: $2.99 (1-hour free trial)
boldCalc, the calculator app designed for the smartwatch.
Watch the app video: https://youtu.be/u0TpHi1FydE
boldCalc uses an innovative “drawing grid”, letting you draw the numbers and operators on your wrist, instead of using tiny buttons. You don’t need perfect drawing skills either–dotCalc uses on-device computer analysis to determine the closest match. Easily multiply, divide, add, and subtract right on your wrist.
Learn more and view detailed app instructions at https://datyell.com/apps/boldcalc
View all my clock faces and apps: https://datyell.com/appgallery
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Shop my clock face bundles and save: https://datyell.com/appbundles